JP6815451B1 - Inverter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for preventing dew condensation inside a housing of an inverter device. SOLUTION: In an inverter device 1, a housing 6 for accommodating a power electronic element and an electrolytic capacitor, an opening formed in the housing 6, and a thermal insulator 9 arranged along the periphery of the opening are provided. It has an inflow pipe 81 and a discharge pipe 82 for cooling water and a body portion 85, and the first surface of the body portion 85 is arranged so as to close the opening from the outside of the housing 6 via a thermal inverter 9. It includes a water jacket 8. The power electronic element is attached to the first surface of the body portion 85, and the electrolytic capacitor is attached to the inside of the housing 6 and is in contact with the inner surface of the housing 6. [Selection diagram] Fig. 1

Description

The present application relates to an inverter device that cools using a water jacket.

When an AC motor is used with a DC power supply, it is converted to AC using an inverter device, and the frequency and current value of this AC are adjusted to control the rotation speed and output (torque) of the AC motor.

Power electronic devices such as FETs (Field Effect Transistors) and IGBTs (Insulated Gate Bipolar Transistors) and electrolytic capacitors are generally used for inverter devices that convert DC to AC and adjust frequency and current values. In recent years, these conversion efficiencies have increased to 90% or more, but much energy is still not converted and is released as heat.
If the power electronic element exceeds the guaranteed performance temperature due to this heat generation, the inverter device will fail, so it is necessary to cool it with cooling water.

The inverter device has a housing formed by a case and a lid that closes the case, and a power electronic element and an electrolytic capacitor are arranged at the bottom of the case constituting the housing.
A water jacket that allows cooling water to flow is attached to the outer surface of the housing of the inverter device. The heat generated from the power electronic element and the electrolytic capacitor by driving the inverter device is cooled by flowing cooling water through the water jacket.

Two major methods are known for cooling an inverter device using a water jacket. The first cooling method is a circulating water method in which cooling water is circulated while being cooled by a radiator, and the second cooling method is a non-circulating water method in which seawater and lake water are used to cool and drain the water as it is.
When an AC motor is used to power an outboard motor, cooling water can be easily obtained and the number of cooling devices such as radiators can be reduced. Therefore, the non-circulating water cooling method is used to cool the inverter device. It is used.

WO2014 / 041892

When using a non-circulating water cooling method that uses water collected from seawater, lake water, etc. as it is, including conventional inverter devices for outboard motors, the water temperature changes significantly depending on the location where the cooling water is collected. There is.
When the temperature of the collected cooling water is low and the inverter device is overcooled and the gas inside the inverter device housing falls below the dew point temperature, dew condensation occurs inside the inverter device housing. As a result, a short circuit between the power electronic elements may occur, causing a malfunction of the inverter device.

The present application has been made to solve the above-mentioned problems, and an object of the present application is to prevent dew condensation inside the housing of the inverter device and to suppress short circuit and malfunction of the inverter device.

The inverter device of the present application includes a housing for accommodating a power electronic element and an electrolytic capacitor, an opening formed in the housing, a thermal insulator arranged along the periphery of the opening, an inflow pipe for cooling water, and a cooling water inflow pipe. The power electronic device comprises a water jacket having a discharge pipe and a body portion, the first surface of the body portion being arranged from the outside of the housing by closing an opening via a thermal insulator. Attached to the first surface of the body portion, the electrolytic capacitor is separated from the water jacket by a thermal insulator , is attached to the inside of the housing, and is in contact with the inner surface of the housing.

In the inverter device of the present application, it is possible to prevent excessive cooling in the housing in which the power electronic element and the electrolytic capacitor are arranged, prevent dew condensation inside the housing of the inverter device, and cause a short circuit and malfunction of the inverter device. Can be suppressed.

It is a perspective view of the inverter device which concerns on Embodiment 1. It is a perspective view observed from the lower surface side of the inverter device which concerns on Embodiment 1. FIG. It is a figure which shows the internal structure of the inverter device which concerns on Embodiment 1. FIG. It is sectional drawing of the inverter device which concerns on Embodiment 1. FIG. It is the schematic of the outboard motor attached to the ship which concerns on Embodiment 1. FIG. It is a figure which shows the internal structure of the outboard motor which concerns on Embodiment 1. FIG. It is a flow chart of the temperature control of the inverter device which concerns on Embodiment 3. FIG. It is a perspective view of the water jacket which concerns on Embodiment 4. FIG. It is sectional drawing of the water jacket which concerns on Embodiment 4. FIG. It is a perspective view of the inverter device which concerns on Embodiment 5. It is a perspective view of the inverter device which concerns on Embodiment 6. It is sectional drawing of the inverter device which concerns on Embodiment 6. It is a perspective view of the water jacket which concerns on Embodiment 7. It is a top view of the inverter device which concerns on Embodiment 7. It is a hardware diagram of temperature control which concerns on Embodiments 2 and 3.

In the description of the embodiment and each figure, the parts with the same reference numerals indicate the same or corresponding parts.

Embodiment 1.
The inverter device 1 according to the first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view of the inverter device 1 according to the first embodiment, and FIG. 2 is a perspective view of the inverter device 1 shown in FIG. 1 observed from the lower surface side. FIG. 3 is a perspective view showing the internal structure of the inverter device 1 according to the first embodiment.
FIG. 4 is a cross-sectional view of the inverter device obtained by cutting the inverter device shown in FIG. 1 in the thickness direction on the surface including the center lines of the inflow pipe 81 and the outflow pipe 82 of the water jacket 8.

As shown in FIG. 1, the housing 6 of the inverter device 1 is formed of a case 2 and a lid 3 that closes the case 2.
FIG. 3 shows the internal structure with the lid 3 removed. An opening 20 surrounded by a broken line is formed inside the housing 6, and a power electronic element 60 that converts a direct current into an alternating current and an electrolytic capacitor 70 that smoothes the direct current are formed inside the housing 6. Is placed. Further, on both sides of the housing 6, an AC power harness 5 for supplying AC power to the AC motor and a DC power harness 4 for supplying DC power to the inverter device 1 are formed.

The case 2 and the lid 3 constituting the housing 6 of the inverter device 1 are preferably metal materials such as aluminum and copper having high thermal conductivity, and aluminum is used in the first embodiment.

As shown in FIGS. 1 and 4, a water jacket 8 for cooling the apparatus using cooling water is attached to the outer surface of the housing 6 of the inverter apparatus 1. The water jacket 8 is a water cooling device that is brought into close contact with a heat generating portion and allows cooling water to flow inside to perform cooling. As shown in FIG. 1, an inflow pipe 81 for introducing cooling water and an outflow for discharging cooling water. It is composed of a pipe 82 and a metal body portion 85 which is a main body portion of the water jacket 8.
Similar to the housing 6 of the inverter device 1, a metal material having high thermal conductivity is suitable for the body portion 85, and aluminum is used in the first embodiment. However, the present invention is not limited to this, and other metals and a plurality of materials having different thermal conductivity can also be used.

In the first embodiment, as can be seen from the internal structure of the housing 6 shown in FIG. 3 and the cross-sectional view shown in FIG. 4, water is formed in the opening 20 formed in the case 2 and surrounded by a broken line. The body portion 85 of the jacket 8 is arranged so as to face each other from the outside of the housing 6. A thermal insulator 9 is formed around the opening 20, and is arranged so that the body portion 85 of the water jacket 8 and the case 2 do not come into direct contact with each other.
A material having a low thermal conductivity such as resin or ceramic is suitable for the thermal insulator 9, and a resin material is used in the first embodiment.

As shown in FIG. 3, a plurality of electrolytic capacitors 70 are arranged on the case bottom 21 inside the housing 6 of the inverter device 1. Further, as described above, an opening 20 surrounded by a broken line is formed in a part of the case bottom 21, and the body portion 85 of the water jacket 8 exposed from the opening 20 toward the inside of the housing 6 The power electronic element 60 is arranged in.
The case bottom 21, the electrolytic capacitor 70, the body 85 of the water jacket 8, and the power electronic element 60 can be arranged directly or by using a cushioning material.

As shown in FIG. 4 and the like, the thermal insulator 9 is arranged around the opening 20 formed in the case 2 and is used to fill the gap between the opening 20 and the body portion 85 of the water jacket 8. .. Therefore, the body portion 85 of the water jacket 8 and the case 2 of the housing 6 are not in direct contact with each other and are substantially thermally separated from each other.

The power electronic element 60 having the largest heat generation in the inverter device 1 is attached to the body portion 85 of the water jacket 8, and high cooling efficiency can be obtained by flowing cooling water.
On the other hand, other components such as the electrolytic capacitor 70 are in direct contact with the case bottom 21 constituting the housing 6 of the inverter device 1 or via a cushioning material or the like, and are different from the water jacket 8 using cooling water. It is separated by a thermal insulator 9. Therefore, the cooling effect of the water jacket 8 does not reach, and only so-called air cooling by contact with the surrounding air becomes possible.

In the inverter device 1 described in the first embodiment, the power electronic element 60 that generates a large amount of heat is water-cooled using the water jacket 8, and the other components are air-cooled with low cooling efficiency. Therefore, the inside of the housing 6 of the inverter device 1 is not excessively cooled, and it is stable even when a non-circulating water cooling method using seawater or lake water with a large change in water temperature as cooling water is applied. Can be cooled.
The non-circulating water type cooling method also has a feature that cooling water can be easily obtained and the number of cooling devices such as radiators can be reduced. When applied to the inverter device 1 of the first embodiment, As an example, it can be applied to an outboard motor that uses an AC motor as power.

FIG. 5 is a schematic view showing a state in which the outboard motor 300 is attached to the ship 200, and FIG. 6 shows an enlarged portion of the outboard motor 300 to show the internal structure.
The outboard motor 300 is attached to the stern, and non-circulating water such as seawater is used for cooling the inverter device 1 and the like.

The inverter device 1 receives DC power from the battery 400, converts it into an AC signal, and drives and controls the power AC motor 500. In the first embodiment, the inverter device 1 is connected to an external electronic unit 700, and the output of the inverter device 1 is controlled by the electronic unit 700.

Arrows 630 and 640 shown in FIG. 6 indicate the flow of cooling water supply and drainage, respectively.
In the inverter device 1, seawater or the like pumped by the pump 600 along the arrow 630 is taken into the water supply pipe 610 as cooling water. Subsequently, cooling water is introduced into the water jacket 8 (not shown) attached to the inverter device 1, and the power electronic element 60 (not shown) in the inverter device 1 is cooled. After that, the cooling water passes through the drain pipe 620 and is drained to the outside of the outboard motor 300 without circulating along the arrow 640.
The other components in the inverter device 1 are cooled by air cooling.

As described above, in the inverter device 1 of the first embodiment, the power electronic element 60 is cooled with high efficiency by using the cooling water, and the failure of the inverter device 1 due to the temperature rise can be prevented. Further, since the other components such as the electrolytic capacitor 70 are air-cooled by contact with the outside air, they are not cooled below the outside air temperature, prevent the occurrence of dew condensation, and cause a short circuit and malfunction of the inverter device 1. It can be suppressed.

Embodiment 2.
In the first embodiment, regarding the components such as the power electronic element 60 and the electrolytic capacitor 70 used in the inverter device 1, the power electronic element 60 is cooled by the water jacket 8 using cooling water, and the other components are air-cooled. By cooling with the above, it was possible to prevent dew condensation without excessive cooling. However, if non-circulating water such as seawater is used for the water jacket 8 and the temperature of the non-circulating water is extremely low, dew condensation may occur.

Generally, in the power electronic element 60 used for the inverter device 1 or the like, the performance guarantee temperature is determined. When the power electronic element 60 exceeds the guaranteed performance temperature, it is necessary to interrupt the drive in order to prevent malfunction, and for that purpose, a temperature sensor for detecting the temperature of the power electronic element 60 is built in.
The amount of cooling water supplied is controlled based on the measurement result of this temperature sensor. Specifically, when the temperature of the power electronic element 60 becomes lower than a certain set temperature, it is determined that the cooling is excessive, and the supply of the cooling water to the water jacket 8 is stopped or the supply amount is small. Be controlled. As a result, cooling is suppressed, the temperature inside the housing 6 of the inverter device 1 is maintained without falling below the outside air, and dew condensation is prevented.

The cooling efficiency of the water jacket 8 depends on the amount of cooling water supplied to the inside. Further, assuming that the same water channel is used, the cooling efficiency is greatly affected by the flow velocity. That is, the cooling efficiency is high when the flow velocity is high, and conversely, when the cooling water pump is stopped and the flow velocity is set to 0, the cooling efficiency is low and basically becomes 0.
Therefore, the cooling of the water jacket 8 can be controlled by adjusting the flow velocity of the cooling water based on the temperature of the power electronic element 60 measured by using the temperature sensor, and the temperature of the non-circulating water such as seawater is remarkably increased. Condensation can be prevented even when the temperature is lowered.

Embodiment 3.
In the second embodiment, it has been described that the temperature is controlled based on the temperature of the power electronic element 60 measured by the temperature sensor built in the power electronic element 60.
The third embodiment is different in that an outside air temperature sensor is provided outside the inverter device 1. By controlling the cooling water pump based on the outside air temperature data acquired by this outside air temperature sensor, it is possible to finely adjust the temperature of the power electronic element 60 and prevent dew condensation inside the housing 6 of the inverter device 1. Will be done.

FIG. 7 shows a flow of temperature control of the inverter device 1 according to the third embodiment.
<Step S001>
The operation of the inverter device 1 is started.
<Step S002>
Subsequently, the temperature of the power electronic element 60 is measured by the temperature sensor.

<Step S003>
The outside air temperature data is acquired by using the outside air temperature sensor installed outside the inverter device 1.
The temperature of the power electronic element 60 is compared with the outside air temperature, and it is determined whether or not the temperature of the power electronic element is higher than the outside air temperature.
When the temperature of the power electronic element 60 is low, it is determined that the cooling is excessive and the process proceeds to step S004. When the temperature of the power electronic element 60 is high, it is determined that the cooling is insufficient and the process proceeds to step S005.

<Step S004>
When the temperature of the power electronic element 60 is low, the cooling water pump is operated and the output is adjusted to be between 0 and 90%.
<Step S005>
When the temperature of the power electronic element 60 is high, the cooling water pump is operated to set the output to 100% and proceed with cooling.

By using the temperature control flow of steps S001 to S005 for the inverter device 1, it is possible to prevent the temperature of the power electronic element 60 from becoming lower than the outside air temperature, and dew condensation inside the housing 6 of the inverter device 1 can occur. Can be prevented.

When it is difficult to continuously control the output of the cooling water pump from 0 to 90%, the same result can be obtained by switching the operation of the cooling water pump ON or OFF. In this case, for example, when the temperature of the power electronic element 60 becomes lower than the outside air temperature, the operation of the cooling water pump is stopped (OFF), and when the temperature becomes higher, the operation is started (ON). The temperature can be controlled.

Embodiment 4.
The basic configuration of the inverter device 1 according to the fourth embodiment is the same as that of the first embodiment, but is characterized in that the structure of the water jacket 8 is different.
FIG. 8A is a perspective view of the water jacket 8 used in the fourth embodiment, showing a state in which the surface on which the cooling plate 86 described later is installed is turned upward. FIG. 8B is a cross-sectional view of the water jacket 8 obtained by cutting the water jacket 8 shown in FIG. 8A in the thickness direction on the surface including the center lines of the inflow pipe 81 and the outflow pipe 82.

In the fourth embodiment, a cooling plate 86 for arranging the power electronic element 60 is provided in a part of the body portion 85 of the water jacket 8.
The water jacket 8 of the inverter device 1 used in the first embodiment and the like was entirely formed of a metal material having excellent thermal conductivity such as aluminum. However, in the fourth embodiment, the main part of the body portion 85 is formed of a resin material, and the cooling plate 86 forming a part of the body portion 85 is formed of a metal material having excellent heat conduction.

In order to enable more local cooling, the cooling plate 86 is preferably substantially the same size as the power electronic element 60 or having a size not exceeding the size of the power electronic element 60.
Further, the cooling plate 86 is preferably formed of a metal material such as aluminum or copper having excellent thermal conductivity, and the copper material is used in the fourth embodiment.

Since the body portion 85 of the water jacket 8 is formed of the resin material and the metal cooling plate 86, the resin material portion can be easily molded and reduced in weight, and the metal cooling plate 86 is used. By doing so, local cooling becomes possible.
By using the water jacket 8 of the fourth embodiment, only the portion requiring cooling can be locally cooled, so that the entire inside of the housing 6 of the inverter device 1 is not overcooled. Condensation can be prevented.

Embodiment 5.
The basic configuration of the inverter device 1 according to the fifth embodiment is the same as that of the first embodiment, but for cooling the electrolytic capacitor 70, a part of the outer surface of the housing 6 of the inverter device 1 is provided. It is characterized in that the fins 22 are formed.
FIG. 9 shows a perspective view of the inverter device 1 used in the fifth embodiment.

In the first embodiment, the power electronic element 60 can be locally cooled by using the water jacket 8, but the electrolytic capacitor 70 is inside the case 2, and is directly or indirectly via a cushioning material or the like. It is in contact with the inner surface of the case 2, and only air cooling is possible by dissipating heat from the flat outer surface of the case 2.
When the output of the power motor to be operated is low, it is not necessary to consider the cooling efficiency of the electrolytic capacitor 70 and the like. If the case 2 is made of a metal material having high thermal conductivity, the temperature rise of the electrolytic capacitor 70 is sufficiently suppressed by air cooling from a flat outer surface.

However, when the output of the power motor is high, it is necessary to increase the output of the inverter device 1, and it is also necessary to consider the temperature rise in the components such as the electrolytic capacitor 70 other than the power electronic element 60.
In the fifth embodiment, when such a high output inverter device 1 is used, fins 22 are provided as shown in FIG. 9 in order to increase the cooling efficiency by air cooling in the case 2 portion. It is a feature.

As the shape of the fin 22, the plate-shaped fin 22 is used in the fifth embodiment as shown in FIG. 9, but the fin 22 is not limited to this shape and has a contact area with the surrounding air. It is sufficient to increase the size, and even a columnar so-called pin fin can be used.

Further, although FIG. 9 shows a diagram in which the fins 22 are formed on the outer surface of the case 2, the same effect can be obtained by forming the fins 22 on the outer surface of the lid 3 that closes the case 2.

In the inverter device 1 of the fifth embodiment, it is possible to prevent the inverter device 1 from failing due to the temperature rise of the power electronic element 60. Further, since the cooling of other components such as the electrolytic capacitor 70 is air cooling by contact with the outside air, it is not cooled below the outside air temperature, the occurrence of dew condensation is prevented, and the inverter device 1 is short-circuited and malfunctions. It is suppressed.
At the same time, since the fins 22 are provided on the outer surface of the housing 6, the components such as the electrolytic capacitor 70 can be sufficiently cooled even when the inverter device 1 has a high output.

Embodiment 6.
The basic configuration of the inverter device 1 according to the sixth embodiment is the same as the configuration in which the fins 22 are provided on the outer surface of the housing 6 according to the fifth embodiment, but the cooling of the electrolytic capacitor 70 is performed. It differs in that it is provided with a canopy 84 extending from the body 85 of the water jacket 8 to further increase efficiency.

FIG. 10A shows a perspective view of the inverter device 1 of the sixth embodiment. Further, FIG. 10B shows a cross-sectional view of the central portion of the inverter device 1 cut along a plane perpendicular to the center line of the inflow pipe 81 and the outflow pipe 82.
As shown in FIGS. 10A and 10B, fins 22 are formed on the outer surface of the housing 6 of the inverter device 1 as in the fifth embodiment. Further, the eaves portion 84 extending from the body portion 85 of the water jacket 8 is formed so as to cover the fins 22 while maintaining a constant gap with the fins 22.

As can be seen from the cross-sectional view of the inverter device 1 of FIG. 10B, the electrolytic capacitor 70 is arranged on the inner surface of the case 2 of the inverter device 1, and fins 22 are formed on the opposite surface of the portion where the electrolytic capacitor 70 is mounted. There is.
The power electronic element 60 is arranged in contact with the water jacket 8. Therefore, the power electronic element 60, which has become hot due to the operation of the inverter device 1, is cooled by the cooling water flowing through the water channel 83 of the water jacket 8.

The water jacket 8 is arranged via a thermal insulator 9 in an opening 20 formed in a case 2 constituting the housing 6 of the inverter device 1 and shown by being surrounded by a broken line. Therefore, the components other than the power electronic element 60, for example, the electrolytic capacitor 70, are thermally separated from the water jacket 8, and the cooling effect of the water jacket 8 does not reach. The electrolytic capacitor 70 is cooled by air cooling from the surface of the case 2 and the fins 22 provided on the case 2.

On the other hand, the fins 22 are covered with the eaves 84 extending from the water jacket 8. The cooling effect of the water jacket 8 cools the eaves portion 84 and the air around it, and as a result, heat dissipation from the fins 22 and the surface of the case 2 is promoted, and the components such as the electrolytic capacitor 70 are cooled.

In the sixth embodiment, it is important that the fins 22 formed in the case 2 and the eaves 84 extending from the water jacket 8 do not come into contact with each other and a constant gap is maintained. If they come into contact with each other, it is possible that the components such as the electrolytic capacitor 70 are excessively cooled and the temperature inside the housing 6 drops too much, which may cause dew condensation.
Further, although an example in which a certain gap made of air is provided between the fin 22 and the eaves portion 84 is shown, a cushioning material having an appropriate thermal conductivity can be sandwiched in the same manner.

As described above, in the inverter device 1 of the sixth embodiment, it is possible to prevent the inverter device 1 from failing due to the temperature rise of the power electronic element 60. Further, since the cooling of other components such as the electrolytic capacitor 70 is air cooling by contact with the outside air, it is not cooled below the outside air temperature, the occurrence of dew condensation is prevented, and the malfunction of the inverter device 1 is suppressed. Will be done.
At the same time, the outer surface of the housing 6 is provided with the fins 22 and the eaves portion 84 extending from the water jacket 8, so that even when the inverter device 1 has a high output, the components such as the electrolytic capacitor 70 are sufficiently provided. Can be cooled.

Embodiment 7.
In the first to sixth embodiments, a thermal insulator 9 made of a material having low thermal conductivity such as resin or ceramic is formed in the opening 20 formed in the case 2, and the water jacket 8 is formed through the thermal insulator 9. Was arranged to face the opening 20.
In the seventh embodiment, the air layer 10 is used between the opening 20 and the water jacket 8 without using resin, ceramic, or the like as the thermal insulator 9 in the opening 20.
The inverter device 1 having this configuration can be applied in an environment where it can be used even if it is not waterproof.

A perspective view of the water jacket 8 of the seventh embodiment is shown in FIG. 11A, and a plan view of the inverter device 1 in which the water jacket 8 is arranged is shown in FIG. 11B.
As shown in FIG. 11A, the water jacket 8 has basically the same shape as the water jacket 8 used in the other embodiments. However, the water jacket 8 of the seventh embodiment is characterized in that flanges 87 are provided at four corners so that the water jacket 8 can be arranged in the opening 20 of the case 2 without using the thermal insulator 9.

In the seventh embodiment, as shown in FIG. 11A, two flanges 87 are arranged on the left and right sides of the inflow pipe 81 and the outflow pipe 82 of the water jacket 8.
The number and arrangement of the flanges 87 are not limited to this, and the number and arrangement of the flanges 87 can be changed according to the size, shape, and the like of the opening 20.

As shown in the plan view of FIG. 11B, the water jacket 8 is arranged in the opening 20 surrounded by the broken line and fixed so as to be bridged by the flange 87. For fixing, screws, adhesive or the like can be used.
In the structure of the seventh embodiment, the heat conduction between the case 2 and the water jacket 8 is suppressed by the air layer 10 without using the thermal insulator 9. Further, although this structure is limited to use in a non-waterproof environment, the inverter device 1 can be obtained with a simple structure.

FIG. 12 shows an example of the hardware 91 that performs calculations such as comparing the temperature of the power electronic element 60 with the outside air temperature and controlling the cooling water pump in the embodiment of the present application.
As shown in the figure, the hardware 91 includes a processor 92 and a storage device 93. Although the storage device is not shown, it includes a volatile storage device such as a random access memory and a non-volatile auxiliary storage device such as a flash memory. Further, an auxiliary storage device of a hard disk may be provided instead of the flash memory. The processor 92 executes the program input from the storage device 93. In this case, a program is input from the auxiliary storage device to the processor 92 via the volatile storage device. Further, the processor 92 may output data such as a calculation result to the volatile storage device of the storage device 93, or may store the data in the auxiliary storage device via the volatile storage device.

Although various exemplary embodiments and examples have been described in the present application, the various features, embodiments, and functions described in one or more embodiments may be applied to the application of a particular embodiment. Not limited, it can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 Inverter device, 2 cases, 3 lids, 4 DC power harnesses, 5 AC power harnesses, 6 housings, 8 water jackets, 9 thermal insulators, 10 air layers, 20 openings, 21 case bottoms, 22 fins, 60 power electronic elements, 70 electrolytic capacitors, 81 inflow pipes, 82 outflow pipes, 83 water channels, 84 eaves, 85 bodies, 86 cooling plates, 87 flanges, 91 hardware, 92 processors, 93 storage devices, 200 ships, 300 Outboard unit, 400 battery, 500 AC motor for power, 600 pump, 610 water supply pipe, 620 drain pipe, 630 arrow, 640 arrow, 700 electronic unit.

Claims (10)

A housing for storing power electronic elements and electrolytic capacitors,
With the opening formed in the housing,
Thermal insulators placed along the perimeter of the opening,
A water jacket having an inflow pipe and a discharge pipe for cooling water and a body portion, and a first surface of the body portion is arranged so as to close the opening from the outside of the housing via the thermal insulator. And with
The power electronic element is attached to the first surface of the body portion and is attached to the first surface.
An inverter device characterized in that the electrolytic capacitor is separated from the water jacket by the thermal insulator , is attached to the inside of the housing, and is in contact with the inner surface of the housing. The inverter device according to claim 1, wherein the thermal insulator is made of resin or ceramic. The inverter device according to claim 1, wherein the thermal insulator is an air layer. Any of claims 1 to 3, wherein the body portion is made of a material having a different thermal conductivity, and the power electronic element is attached to a portion made of a material having a higher thermal conductivity. The inverter device according to item 1. Claims 1 to 1, wherein a metal cooling plate having a size not exceeding the size of the power electronic element is attached to a portion of the body portion to which the power electronic element is attached. The inverter device according to any one of 3. The inverter device according to any one of claims 1 to 5, wherein fins for heat dissipation are formed on the outer surface of the housing. The inverter device according to claim 6, wherein the fins have a plate shape or a columnar shape. The inverter device according to claim 6 or 7, wherein a eaves portion extending from the body portion and arranged so as to cover the fins without contacting the fins and the housing is provided. The inverter device according to any one of claims 1 to 8, wherein the amount of cooling water supplied to the water jacket is controlled according to the temperature of the power electronic element. The inverter device according to claim 9, wherein when the temperature of the power electronic element falls below the outside air temperature, the supply of cooling water is stopped or the supply amount is reduced.

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